mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
94afd069d9
Currently unsigned ints are used to represent instructions on powerpc. This has worked well as instructions have always been 4 byte words. However, ISA v3.1 introduces some changes to instructions that mean this scheme will no longer work as well. This change is Prefixed Instructions. A prefixed instruction is made up of a word prefix followed by a word suffix to make an 8 byte double word instruction. No matter the endianness of the system the prefix always comes first. Prefixed instructions are only planned for powerpc64. Introduce a ppc_inst type to represent both prefixed and word instructions on powerpc64 while keeping it possible to exclusively have word instructions on powerpc32. Signed-off-by: Jordan Niethe <jniethe5@gmail.com> [mpe: Fix compile error in emulate_spe()] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200506034050.24806-12-jniethe5@gmail.com
20 lines
506 B
C
20 lines
506 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright 2010 Michael Ellerman, IBM Corp.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/jump_label.h>
|
|
#include <asm/code-patching.h>
|
|
#include <asm/inst.h>
|
|
|
|
void arch_jump_label_transform(struct jump_entry *entry,
|
|
enum jump_label_type type)
|
|
{
|
|
struct ppc_inst *addr = (struct ppc_inst *)(unsigned long)entry->code;
|
|
|
|
if (type == JUMP_LABEL_JMP)
|
|
patch_branch(addr, entry->target, 0);
|
|
else
|
|
patch_instruction(addr, ppc_inst(PPC_INST_NOP));
|
|
}
|